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/*
* Copyright © 2010 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
#include <stdbool.h>
struct ra_class;
struct ra_regs;
/* @{
* Register set setup.
*
* This should be done once at backend initializaion, as
* ra_set_finalize is O(r^2*c^2). The registers may be virtual
* registers, such as aligned register pairs that conflict with the
* two real registers from which they are composed.
*/
struct ra_regs *ra_alloc_reg_set(void *mem_ctx, unsigned int count);
void ra_set_allocate_round_robin(struct ra_regs *regs);
unsigned int ra_alloc_reg_class(struct ra_regs *regs);
void ra_add_reg_conflict(struct ra_regs *regs,
unsigned int r1, unsigned int r2);
void ra_add_transitive_reg_conflict(struct ra_regs *regs,
unsigned int base_reg, unsigned int reg);
void ra_class_add_reg(struct ra_regs *regs, unsigned int c, unsigned int reg);
void ra_set_num_conflicts(struct ra_regs *regs, unsigned int class_a,
unsigned int class_b, unsigned int num_conflicts);
void ra_set_finalize(struct ra_regs *regs, unsigned int **conflicts);
/** @} */
/** @{ Interference graph setup.
*
* Each interference graph node is a virtual variable in the IL. It
* is up to the user to ra_set_node_class() for the virtual variable,
* and compute live ranges and ra_node_interfere() between conflicting
* live ranges. Note that an interference *must not* be added between
* two nodes if their classes haven't been assigned yet. The user
* should set the class of each node before building the interference
* graph.
*/
struct ra_graph *ra_alloc_interference_graph(struct ra_regs *regs,
unsigned int count);
void ra_set_node_class(struct ra_graph *g, unsigned int n, unsigned int c);
void ra_add_node_interference(struct ra_graph *g,
unsigned int n1, unsigned int n2);
/** @} */
/** @{ Graph-coloring register allocation */
bool ra_allocate(struct ra_graph *g);
unsigned int ra_get_node_reg(struct ra_graph *g, unsigned int n);
void ra_set_node_reg(struct ra_graph * g, unsigned int n, unsigned int reg);
void ra_set_node_spill_cost(struct ra_graph *g, unsigned int n, float cost);
int ra_get_best_spill_node(struct ra_graph *g);
/** @} */
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